Safety installation of bridge expansion joint of bridge expansion joint
The construction unit for expansion joint hoisting, check the center line and center line girder seam is coincident, its top surface and surface elevation is consistent, timely adjustment。 The pre delivery of rebar and anchor joints welded firmly, then across the 12 or 16 level steel。 Must immediately dismantle the expansion joint positioning plate, chisel to locate the screw, and the angle to the wheel abrasion welding scar, fill the paint adhesive tape or wood。 The top surface of the seam sealing joints, the notch part is No。 50 pouring concrete; with insert type vibrator, vibration compacting concrete fully。 Smooth surface。 Using a ruler to check excessive expansion joint top surface。 Over the period, should as far as possible with the roadSmooth。 The concrete health rear can be opened to traffic。 With the wall, the pavement structure of the expansion joints, to participate in the installation process。
Expansion joint preparation before installation:
should check the docking bridge joint seam is certificate of steel bearing bridge expansion, specifications, and invite relevant personnel supervision, design and appearance of the telescopic joint, check and acceptance of geometric precision, qualified rear can use. The line on the bridge, cutting: according to the design position of expansion joint line release and, according to the size of design from the centerline position measurement of expansion joint of concrete protective line, with concrete cutting machine by drawing a line cutting deck asphalt concrete. In order to ensure the cutting edge is not damaged, can be divided into two. The first cutting slit distance protection line to be reserved for the 5cm, before pouring the concrete, and then along the accurateSecond. Cutting edge cutting requirements straight, accurate cutting, careful not to damage the waterproofing layer, the waterproof layer up to be protected.
The bridge must be timely cleaning, filling gap: with artificial air compressor to clear cutting asphalt concrete range, and chiseling concrete loose, while the joint internal debris to clean up。 The slit width must meet the design requirements after cleaning with width, the benzene board expansion joint block strict recovery。 The embedded anchor bar。 The number of reserved rebar should be consistent with the design drawings, if it does not correspond to timely repair welding。 Using air compressor to clean up again。 In order to prevent the expansion joint installation process of weld burn in foam board, foam board on both sides of steel or iron cover。